(Contents information excerpted from The Internet Speculative Fiction Database)
Art:
- Retief's War (Part 1 of 3) by Jack Gaughan
- Origin of Species by Gray Morrow
- An Ounce of Emotion by John Giunta
- Skylark Duquesne (Part 5 of 5) by Gray Morrow
Essays:
- Where Are They Now? by Frederik Pohl
- Bibliography: The Natural History of Retief by uncredited
- Hue and Cry (If, October 1965) by Frederik Pohl
Novelettes:
- Origin of Species by Robert F. Young
- An Ounce of Emotion by Gordon R. Dickson
Serials:
- Retief's War (Part 1 of 3) by Keith Laumer
- Skylark Duquesne (Part 5 of 5) by Edward E. Smith
Short Stories:
- A Leader for Yesteryear by Mack Reynolds
- The Smiling Future by Miriam Allen deFord
- Purpose by Edward V. Dong
- Short Trip to Nowhere by Robert Moore Williams